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Armour Class: Difference between revisions

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The default formula that determines AC is:
The default formula that determines AC is:
: {{InfoBlob|10 + [[Dexterity|Dexterity modifier]] + armour bonus + shield bonus + other bonuses and penalties}}
: {{InfoBlob|10 + [[Dexterity|Dexterity modifier]] + armour bonus + shield bonus + other bonuses and penalties}}
[[Armour#Medium armour|Medium]] armour caps the Dexterity Modifier to +2.{{note|The [[Medium Armour Master]] feat increases the cap from +2 to +3.}}{{note|Four rare armours have an "Exotic Material" trait that allow the wearer to get the full Dexterity bonus to AC, namely [[Yuan-Ti Scale Mail]], [[Unwanted Masterwork Scalemail]], [[Sharpened Snare Cuirass]], and [[Armour of Agility]].}} [[Armour#Heavy armour|Heavy]] armour ignores the modifier entirely.
[[Armour#Medium armour|Medium]] armour caps the Dexterity Modifier to +2.{{ref|The [[Medium Armour Master]] feat increases the cap from +2 to +3.}}{{ref|Four rare armours have an "Exotic Material" trait that allow the wearer to get the full Dexterity bonus to AC, namely [[Yuan-Ti Scale Mail]], [[Unwanted Masterwork Scalemail]], [[Sharpened Snare Cuirass]], and [[Armour of Agility]].}} [[Armour#Heavy armour|Heavy]] armour ignores the modifier entirely.


Shields will grant the listed AC bonus to whoever equips them, regardless of which weapon slot they are currently using.
Shields will grant the listed AC bonus to whoever equips them, regardless of which weapon slot they are currently using.


=== Other formulas ===
=== Other formulas ===
Unarmoured creatures may use one of the following different formulas if they have certain features. Creatures always use whichever formula would result in a higher AC among those they have access to.{{note|Alternative formulas are only used if {{em|no}} items are worn in the chest, hands, helm or boots slots which are labelled as armour. The Monk version also stops working if a shield is carried.|name=slots}}
Unarmoured creatures may use one of the following different formulas if they have certain features. Creatures always use whichever formula would result in a higher AC among those they have access to.{{ref|Alternative formulas are only used if {{em|no}} items are worn in the chest, hands, helm or boots slots which are labelled as armour. The Monk version also stops working if a shield is carried.|name=slots}}


{{SAI|Mage Armour}} or {{SAI|Draconic Resilience}}:
{{SAI|Mage Armour}} or {{SAI|Draconic Resilience}}:
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The difference between 25 and 24 is even greater, with a {{em|100%}} increase in effectiveness (50 vs 100 rounds).
The difference between 25 and 24 is even greater, with a {{em|100%}} increase in effectiveness (50 vs 100 rounds).


== Increases to Amour Class ==
== Items increasing Amour Class ==
{| class="wikitable sortable"
{{Table alignment}}
|+Items
{| class="wikitable defaultleft col3center col5center sortable"
!Equipment
!Equipment
!Slot
!Slot
!AC Increase
!AC Increase
!Armour Class Stat-line
!Effect
!Found in Act
!Found in Act
|-
|-
|[[Wondrous Gloves]]
|{{LgRarityItem|Cloak of Protection}}
|[[Gloves]]
|{{Equipment slot|Cloak}}
| +1
| +1
|Your [[Armour Class]] increases by '''1'''. In addition, if you have [[Bardic Inspiration]], you gain 1 more use of it.
|[[Armour Class]] +1
|1
[[Saving throw]] +1
|2
|-
|-
|[[Ring of Protection]]
|{{LgRarityItem|Defender Flail}}
|[[Rings]]
|{{Equipment slot|Main Hand Melee}}
| +1
| +1
|The wearer of this item gains [[Armour Class]] +1, [[Saving throw]] +1.
|{{Passive|Steel Physiology}}
|1
[[Armour Class]] +1
|2
|-
|-
|[[Cloak of Protection]]
|{{LgRarityItem|Ring of Protection}}
|[[Cloaks]]
|{{Equipment slot|Ring}}
| +1
| +1
|The wearer of this item gains [[Armour Class]] +1, [[Saving throw]] +1
|[[Armour Class]] +1
|2
[[Saving throw]] +1
|1
|-
|-
|[[Defender Flail]]
|{{LgRarityItem|Wondrous Gloves}}
|[[Main Hand Melee]]
|{{Equipment slot|Gloves}}
| +1
| +1
|'''The holder of this item gains:'''
|{{Passive|Troubadour's Wonder}}
 
|1
* [[Armour Class]] +1
 
; [[Steel Physiology]]
: Reduce incoming [[Bludgeoning]], [[Piercing]], and [[Slashing]] damage by 1.
|2
|}
|}


== Footnotes ==
== Notes ==
{{notebegin}}
{{reflist}}
{{notelist}}
{{notelist}}
 
{{noteend}}
{{NavGameplay}}
{{NavGameplay}}


[[Category:Gameplay mechanics]]
[[Category:Gameplay mechanics]]

Latest revision as of 02:41, 27 November 2024

Armour Class (AC) is a measurement of how difficult a creature is to be hit by an attack. In order to successfully hit a creature, the results of an attack roll must have a number equal to or greater than the target's Armour Class. AC can be increased by equipping armour and shields, by selecting certain feats when leveling up, or utilizing certain spells.

Formulas[edit | edit source]

The default formula that determines AC is:

10 + Dexterity modifier + armour bonus + shield bonus + other bonuses and penalties

Medium armour caps the Dexterity Modifier to +2.[1][2] Heavy armour ignores the modifier entirely.

Shields will grant the listed AC bonus to whoever equips them, regardless of which weapon slot they are currently using.

Other formulas[edit | edit source]

Unarmoured creatures may use one of the following different formulas if they have certain features. Creatures always use whichever formula would result in a higher AC among those they have access to.[3]

Mage Armour Mage Armour or Draconic Resilience Draconic Resilience:

13 + Dexterity modifier + shield bonus + other bonuses and penalties

Unarmoured Defence (Barbarian) Unarmoured Defence (Barbarian):

10 + Constitution modifier + Dexterity modifier + shield bonus + other bonuses and penalties

Unarmoured Defence (Monk) Unarmoured Defence (Monk):

10 + Wisdom modifier + Dexterity modifier + other bonuses and penalties

Mathematics[edit | edit source]

Armour Class becomes more useful the greater it is; for instance, the difference in effectiveness between 20 and 19 AC is greater than the difference in effectiveness between 16 and 15.

To illustrate this, if a defender has 15 AC and 10 HP, and the attacker has +4 (50% chance to hit) to attack rolls, and deals 2 damage per attack, the defender would on average survive for 10 turns.

If the defender's AC was increased to 16 (45% chance to be hit), they would instead survive for an average of 11.1 rounds (an 11% increase in effectiveness).

Meanwhile, if the defender has 19 AC (30% chance to be hit), they would survive for an average of 16.66 rounds. If their AC was increased to 20 (25% chance to be hit), they would be able to survive for an average of 20 rounds (a 20% increase in effectiveness).

The difference between 25 and 24 is even greater, with a 100% increase in effectiveness (50 vs 100 rounds).

Items increasing Amour Class[edit | edit source]

Equipment Slot AC Increase Effect Found in Act
Cloak of Protection Cloak Cloak +1 Armour Class +1

Saving throw +1

2
Defender Flail Main Hand Melee Main Hand Melee +1
Steel Physiology
Reduce incoming Damage TypesBludgeoning, Damage TypesPiercing, and Damage TypesSlashing damage by 1.

Armour Class +1

2
Ring of Protection Ring Ring +1 Armour Class +1

Saving throw +1

1
Wondrous Gloves Gloves Gloves +1
Troubadour's Wonder
Your Armour Class Armour Class increases by 1. In addition, if you have Bardic Inspiration Bardic Inspiration, you gain 1 more use of it.
 1

Notes[edit | edit source]

  1. ↑ The Medium Armour Master feat increases the cap from +2 to +3.
  2. ↑ Four rare armours have an "Exotic Material" trait that allow the wearer to get the full Dexterity bonus to AC, namely Yuan-Ti Scale Mail, Unwanted Masterwork Scalemail, Sharpened Snare Cuirass, and Armour of Agility.
  3. ↑ Alternative formulas are only used if no items are worn in the chest, hands, helm or boots slots which are labelled as armour. The Monk version also stops working if a shield is carried.
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